Jd 455 Snow Plow(Front) Blade (Left/right) Hydr., Cylinder Leak-

took a closer look at why the blade is so 'wobbly', and found the 'angle' cylinder is leaking( externally)
, and i can move the whole blade left to right by hand easily----
also i found no diverter valve by the hydr. lines under the foot rest----
my question is-----is it possible that this model does not have a 'diverter' valve, and that once i replace the faulty cylinder, the blade will stay in the correct position even if force is put upon the blade---(like when i'm pushing snow off to the side, at a slight angle)?
thanks to anyone with a comment on this---

i did try to find any info on how the hydraulic system works---specifically when blade is attached and deck is off, but nothing is very clear---to me anyway---

That cylinder may be the same part as the lift cylinder and the same part as the newer JD 4/5x5 series and the 700's. You can look for a used cylinder as well. You don't need the whole kit with the hoses and fittings just the cylinder. It is possible to repair them but you need to cut the cylinder open and then reweld it after repairs. A hydraulic shop may be able to give you a quote on doing that.